Chain



FIG. 1 is a perspective view of a chain showing the new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a back elevation view thereof;

FIG. 5 is a left-side view thereof;

FIG. 6 is a right-side view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The dash-dot broken lines represent a break line, which depicts a symbolic break in the length of the chain. The dash-dash broken lines illustrate portions of the chain. The broken lines, and the appearance of any portion of the article between the break lines, form no part of the claimed design. 

CLAIM The ornamental design for a chain, as shown and described. 